FARM sroRAc.iis FOR APFn.i:s 



Ki)>urc II. Two-slorv St(>r;i«i' with I'.ukiiiH Koorn. 



Concrete wall below yirouiul insiikilcd vvilh shccl cork. I''r;inic coiislruclioii .ihovi- uroiiiul in- 

 sulated with fill insulation. 



Corkhoanl is i lie acccpi cd Upc ol iiisiilal ion lor luasonry (-(tiisl riicl ion. F^x- 

 poscd masonry walls arc coninionK insnialcd v\ il li A iiu he ■ ()| \-oii<|)();ii d mikI walls 

 below grade, with 2 or A indies. In new liij;li-j;i ade ma .oin \ consl i U( I ion, rools 

 ai-eusiiail\ insul..le.i 1.x la\in^ \ inches of corkboai .1 on lopol (lie (l.il roof (h'ck, 

 and the cork is |.role( l(<l uillia lai- and gravel rool. 



Sheet rorkhoard walls are |)rotecte(l either by a double loal ol i.oilland cement 

 plasterer with a mastic prepared si)ecifically for this purpose. I he latter is prob- 

 ably fully as effective for scaling against moisture, while I lie to: nier is stronger 

 and serves as a better protection against mechanical injnrx . (Cilings in sonic 

 cases are protected with plaster, although mori- eoniinonK uiili a mastic finish. 



I'rincipk's of Mechanical Kefrij*erali<tn 



All ni.'(liani<,d relrigeial ion sVslenis drp.nd loi lluir op,-, ;, I i.,n on I lie lad 

 that a li(|uid ab.sorbs lic.il on evaporali(jn. (Jn ihi.- prin(i|)le, a liipiid ha\ ing a 

 low boiling point is allowed lo expand into a set of pipes in which a relatively low 

 pressure is maintained. The liipiid evajjorales at this low pressure and abstracts 

 heal from the walls of I he pi|)e, thus cooling the .lir or li(|uid surroundinK I he 

 l)ipes. A com pressor draws the \,ipoi- from the era /jonilhi};, coils, keeping lliein at 

 a low pressure, ami foices i( inio anolher set of coils known ;is (he rtnidcvser 



DPP 



Fijjure 12. Diagram of Kefrigeralion System. 



